Oxygenator



FIG. 1 is a first perspective view of an oxygenator;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken line showing in the figures illustrates the environment and forms no part of the claimed design. 

CLAIM The ornamental design for an oxygenator, as shown and described. 